Why the 13th Is More Likely to Fall on a Friday Than Any Other Day
Friday the 13th has a reputation that goes far beyond math. Some people treat it as bad luck. Others barely notice it. But there is a genuinely interesting mathematical fact hiding behind the superstition: In the Gregorian calendar, the 13th of the month falls on a Friday more often than on any other weekday. This isn’t folklore or coincidence. I
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